/*
	pcx.c

	pcx image handling

	Copyright (C) 1996-1997  Id Software, Inc.

	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

	See the GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

	$Id$
*/

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include "console.h"
#include "pcx.h"
#include "qendian.h"
#include "qtypes.h"
#include "quakefs.h"

byte       *pcx_rgb;

/*
	LoadPCX
*/
void
LoadPCX (QFile *f)
{
	pcx_t      *pcx, pcxbuf;
	byte        palette[768];
	byte       *pix;
	int         x, y;
	int         dataByte, runLength;
	int         count;

	// 
	// parse the PCX file
	// 
	Qread (f, &pcxbuf, sizeof (pcxbuf));

	pcx = &pcxbuf;

	pcx->xmax = LittleShort (pcx->xmax);
	pcx->xmin = LittleShort (pcx->xmin);
	pcx->ymax = LittleShort (pcx->ymax);
	pcx->ymin = LittleShort (pcx->ymin);
	pcx->hres = LittleShort (pcx->hres);
	pcx->vres = LittleShort (pcx->vres);
	pcx->bytes_per_line = LittleShort (pcx->bytes_per_line);
	pcx->palette_type = LittleShort (pcx->palette_type);

	if (pcx->manufacturer != 0x0a
		|| pcx->version != 5
		|| pcx->encoding != 1
		|| pcx->bits_per_pixel != 8 || pcx->xmax >= 320 || pcx->ymax >= 256) {
		Con_Printf ("Bad pcx file\n");
		return;
	}
	// seek to palette
	Qseek (f, -768, SEEK_END);
	Qread (f, palette, 768);

	Qseek (f, sizeof (pcxbuf) - 4, SEEK_SET);

	count = (pcx->xmax + 1) * (pcx->ymax + 1);
	pcx_rgb = malloc (count * 4);

	for (y = 0; y <= pcx->ymax; y++) {
		pix = pcx_rgb + 4 * y * (pcx->xmax + 1);
		for (x = 0; x <= pcx->ymax;) {
			dataByte = Qgetc (f);

			if ((dataByte & 0xC0) == 0xC0) {
				runLength = dataByte & 0x3F;
				dataByte = Qgetc (f);
			} else {
				runLength = 1;
			}

			while (runLength-- > 0) {
				pix[0] = palette[dataByte * 3];
				pix[1] = palette[dataByte * 3 + 1];
				pix[2] = palette[dataByte * 3 + 2];
				pix[3] = 255;
				pix += 4;
				x++;
			}
		}
	}
}